<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    let username = prompt('请输入用户名')
    let password = prompt('请输入密码')
    if(username ==='admin' && password ==='123456')
{
    alert('登录成功')
}
else
{
    alert('登录失败')
}
</script>
</html>